流路変動の発達機序の解明に向けた水表面と水底面の曲面形状の対応関係の把握  [in Japanese] RELATIONSHIP BETWEEN WATER SURFACE AND BED SURFACE ON CHANNEL EVOLUTION  [in Japanese]

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Abstract

流路変動の発達機序を定量的に明らかにするために水表面と水底面の曲面形状の対応関係を把握した.流路変動についての研究は世界中で数多く実施されてきたが,水底面や水理量の時空間分布の実測情報が不足しているため,その発達機序を解明するには至っていない.本研究では,浸食性河岸を有する直線流路を用いた移動床模型実験を実施し,水表面と水底面の高密度な計測を実施した.計測値から流路変動の発達時に水底面に対応した水表面の曲面形状が形成されていることが明らかとなった.さらに,計測値から求めた水面勾配から交互砂州の流下停止,横断方向への砂州の伸長などの流路変動の発達機序を説明できることが示唆された.

 We investigated relationship between water surface and bed surface toward quantitively understand the developmental mechanics of channel evolution. Since there has been poorly measured data, the developmental mechanics of channel evolution has not been understood yet. In this study, we conducted flume experiments using straight channel with erodible bank, and conducted high-density measurement of the water surface and bed surface. The measurement results shows that there are formed curved shape of the water surface corresponding to the bed surface on channel evolution. Additionally, it was suggested that using the measured gradient of water surface explain the developmental mechanics of channel evolution linked with bars dynamics and channel shape such as non-migrated alternate bars and elongation of bar in transverse direction.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74(4), I_1123-I_1128, 2018

    Japan Society of Civil Engineers

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